Priming cock



Jul 15, 1924.- 1,501,526

, c. R. SHORT ET AL PRIMING COCK 7 Filed Aug. 5, 1920 Patented July 15, 1924;.

UNETEO PATENT OFFlCE.

CHARLES R. SEOR-T, OF DAYTON, CF10, AND REX O. DARNELL, OF DETROIT, MiCI-IIGAN, ASSIGNORS TO GENERAL MOTORS RESEARCH CORPORATION, OF DAYTON, OHIO, A

CORPORATION OF DELAWARE.

ran tine coon.

Application filed August 3, 1920.

To all whom it may concern- Be it known that we, CHARLES R. SHORT, a Subject of the King of Great Britain, and Rnx G. DARNELL, a citizen of the United States, residing at Dayton, county of Montgomery, State of Ohio, and Detroit, county of Wayne, State of Michigan, respectively, have invented certain new and useful improvements inPriming Cocks, of which the following is a full, clear, and exact descrlption.

This invention relates to internal-combustion engines and particularly to certain improvements in devices for priming the intake manifold or cylinders for starting purposes.

It is frequently necessary, especially in cold weather, to discharge into the cylinder or intake manifold of an internal-combns; tion engine, a quantity of easily vaporized liquid fuel before the engine car be started.

One of the objects of this invention is the provision of a simple and efiective print ing device for permitting the introduction of such fuel into the intake or cylinders.

Another object of the invention is the provision of a priming device that is cheap to manufacture, easily applied, simple in construction and operation, and that is not likely to get out of order.

Other objects and advantages will appear from the following description and claims:

On the drawings:

Fig. 1 is a side elevation of an engine showing our devices in position thereon.

Fig. 2 is a cross section of a portion of the cylinder head showing the priming device, partly in section, in position to permit the entry of the priming fluid.

Fig. 3 is a view similar to that shown in Fig. '2, but showing the device in closed position.

The reference character 10 designates an internal-combustion engine of the usual construction having the intake manifold 11 and cylinder head 12.

An aperture or passage 15 is provided in the cylinder head 12 or intake manifold for the admission of the priming fluid, and, as shown, the aperture 15 is counter-bored or enlarged for a portion of its length so as to form a shoulder or valve seat 16, the enlarged portion being internally threaded.

The priming device, indicated as a whole Serial No. 400,951.

by the numeral 20, consists of a receptacle 25 having a cylindrical extension or stem 26, the lower end of which is reduced by having a part or parts removed as indicated at 2. and which terminates in a conically shaped end forming a valve 28 which is adapted to engage the shoulder or valve seat 16. The angle formed by the valve 28 is such that it engages the seat only on a circular line, and therefore, may be firmly seated without the use of tools, to make a very effective non-leaking joint. is I The upper portion of the extension 0 stem 26 is screw-threaded in order to enable the device to be secured in the passage 15 and, to facilitate the screwing and unscrew ing of the device, the upper'part of the recoptacle may be knurled as shown.

A conduit 80in the stem 26 leads from the receptacle 25 to the surfaceof the reduced portion 27 above the valve 28. As shown, the lower end of this conduit is formed by a transversely extending portion, open at its ends.

When the device is in the position shown in Fig. 2, priming fluid poured into the receptacle 25) will pass down along the conduit 30 and the reduced portion 27 of the stem 26 and passing the valve 28 escape into the combustion chamber. When a suificient amount of the priming fluid has been introduced, the device is screwed down until the valve 28 properly engages its seat 16 and closes the aperture 15.

It should be understood that it is not necessary that the conduit 30 have the specific form shown, as any form of condult leading from the receptacle 25 to a point immediately above the valve 28 may be used. Moreover, the whole lower end of the stem need not be reduced to permit the priming fluid to pass between the walls of the counterbore and the stem. It is suflicient that enough of the stem adjacent the end of the conduit 30 be reduced by removing parts, to permit the flow of the priming fluid therefrom down to and through the valve 2816.

It will be noted that the means for securing the device in position is utilized for manipulating the valve. By the use of a conical valve with a threaded stem, having means for manually turning the same, the valve may be easily seated and effectively closes the aperture 15 Moreover it- Will be noted that the device is a one-piece structure that may be applied to any engine simply by properly aperturing the cylinder head or intake manifoldfand screwing the device therein.

The invention is not to be considered limited in its application to the particular construction herein illustrated, as changes may be made in the construction shown Without departing from the spirit of the invention and the scope of the appended claims.

We claim: 7

1. In combination, an engine having a passage through a Wall thereof, a valve seat Within said passage and a priming device, including a stem, removably secured in the aperture; the stem having a portion re moved adjacent to and terminating in a valveadapted to engage the valve seat, the stem also being provided With a conduit affording communication between the eX- terior of the engine and the surface adjacent to the valve.

2; In combination, an engine having a passage through a Wall thereof, the passage having a screw-threaded counterbore providing a valveseat Within the passage; and aprimingdevice including a receptacle for containing a charge of priming fluid; a stem secured to the receptacle and having screwthreads thereon to engage the threads in the counterbore, said stem also having a portion adjacent its end removed to form a reduced portion and terminating in a conical valve 3 for engaging the valve seat only; and a conduit connecting the outer surface of the reduced portion With the receptacle.

3. In combination a cylinder head having a passage theret-hrough; a valve seat 4 within the passage; a one-piece priming device including a receptacle for receiving a charge of priming fluid; a stem secured to the receptacle and provided With a conduit, reinovably secured in the passage, the lower 4 end of the stem being reduced and formed into a valve adapted to engage the valve seat; the conduit adapted to conduct the priming fluid from the receptacle to the surface of the reduced portion of the stem; 5

and means for rotatably securing the stem Within the passage.

In testlniony whereof We hereto ailix our signatures.

REX C. DARNELL. Witness to signature of Rex C. Darnell.

F. H. FLEMING.

CHARLES R. SHORT. IVitnesses to signature of Charles -R. Short:

ROBERT E. SMITH, ALVINA G. LEHM'AN. 

